Improvement in cobble-stone pavements



P. ZDH.`

. Cobble Stone-Pave'ments.

Patented Sept. 15, 18.74.

' fag.-

Fall.

`forming a part of this [UNITED N.SI'IA'Iuzs .PATENT OFFICE.

' PHILIP ZADIG, oF sAN FRANCISCO, CALIFORNIA.v

lMPRovEMENr coBBLE-sToNE PAvEMEN'rs.

...Il Specification forming partof Lettere Patent -N o. 154,999, dated September 15, 1874; application filed August 22, 1874.,

To all whom it may/concern:

Be it known that I, PHILIP ZADIG, of San Francisco, county of San Francisco and State an improved ask in which the blocks are molded. It consists mainly in providing a concrete block with elevation and depression or corrugations, to afford a better foot-hold for animals.

The flask in which the block is formed differs essentially from that described in my former specification, for which Letters Patent were granted to me July 25, 1874, from the fact that I divide the iiask vertically to its base, which admits of the two parts forming the sides and ends to be removed, and leaves the block, when formed and set, upon the base.

board or bottom of the mold. The bottom of the mold is provided with semi-oval depres.

sions, so that when the block is removed, oval ridges will remain upon its face, all of which will hereinafter more fully appear.

Referring to the accompanying drawings specification, Figure l is a side sectional elevation of my improved ask; Fig. 2, a plan; Fig. 3, a side elevation,

in section, of the block.

In my present construction of flasks, A represents a removable base, provided with a raised center and grooved center, B, around which center the sides of the ask fit closely.

Two of these sides G, which form the compartment, are entire, while the adjoining two are divided vertically to the base-plate, as shown, and are made with tongues and grooves D, so that the sides of the ilask can be easily removed, and leave the composition or concrete of which the paving-block is formed upon the raised and corrugated portion B of the basa plate. These divisions are kept in place by hooks and eyes or clamps E, attached to the sides and base-plate ofthe flask.

for giving it the necessary softness, and add to it about fifteen per cent. of pulverized limerock, serpentine rock, or chalk-rock, in order to impart the requisite hardness to resist the rays ofthe sun; then` mix with this mass a good proportion of coarse gravel and pebbles,

` and boil the whole a sufficient length of time,

in order that all the particles of the same be well coated with the mixture of the asphaltic compound. I now put the molds in position, and begin with pouring upon the bottom a quarter of an inch of dry ine gravel. Afterl that I ll the bottom with Cobble-stones, pressing them down between the ne gravel upon the bottom of the mold.

rlhe cobbles may be of different sizesk and shapes, but in a mold six inches deep they ought not to be broader than three and a half nor higher than five and a half inches. I begin by pouring the most liquefied part of the asphaltum upon and between the stones, making sure that it penetrates all the minute'st parts of the line gravel, and continue the lilling with coarser parts of the mass, so that the pebbles or coarser portion is laid upon and between the upper half of the cobbles, and

avoid as much as possible to build upon the' last half inch of the mold or block anything but ne gravel, so that there be no projections on the top, because the top of the mold will form the base or foundation of the block when laid down. e

Care should lbe taken that the platform of the floor upon which the mold is standing when filled be placed in a horizontal and level position. After three hours7 cooling the mold or flask can be taken off.

`At any time before filling again the sides and .bottom of the mold should receive a new coating of lime in solution. l 's After the mold has been teken off, the block is ready to be laid, and is to be turned bottom up, so that the groove Will be upon its upper fece, als shown in Fig. 3,

The blocks, as I make them, ten by twentytwo inches by six inches deep, are laid with spaces of two inches, between which spaces, af

ter the street is leid out, are filled With pebbles of about one inchand a, half in dimension, ndv hot'as'phaltum miX'edWth tar poured up'on'it The above space is preferable, in order to giveY the liquid siJ better chance to penetrate to ,the` bottom and fill the gap. By this construction e block is made of 'great dar-'bility'a-nd strength, possessing the-advantage also of bei in g prepared at the factory in advance for future use. Having thus described my invention, what .in set fortlraind speeiied.

I claim as new, and desire tosecure by Letters Patent, 'isv 1 y 1.' A block for'pavements, composed 'of cobble-stones with a grooved or corrugated surface, when the same is constructed and built up in the manner and of the materials as here- 2. A flask in which to form or mold concrete blocks, Whose sides G etre divided and removable, substantially as described and shown.

3. In a, flask for' molding Concrete blocks, a

removable baise, A, 'provided with a 'corru- .gated or grooved surface, B, substantially as and for the purpose described.

In witness whereof I have hereunto set my handandseel. l l PHILIP lZADIG. [L s] Witnesses: t A

C. W. M. SMITH, E. V. SUTTER. 

